Restore the OpenHTF TofuPilot context manager

Bench scripts using with TofuPilot(test): work again without code changes, while a deprecation warning points to the recommended upload callback and CLI operator UI.

• Added the TofuPilot context manager back as a thin wrapper around the upload output callback, keeping the historical quiet Ctrl-C exit
• Fixed duplicate uploads when reusing one test object across several runs, and restored console quieting between runs
• Fixed attachment uploads to always verify TLS with the client's CA bundle on self-hosted instances with a private CA